After a long search I finally located a standard compound with the top and bottom slides for a 1300 Clausing I've had sitting around for ayear. When I found the lathe it it had a dual post type cross slide without a compound. Anyway, the new bottom slide did not come with a gib. No problem, (I thought), I'll just use the tapered gib from the original slide. Well the dovetail on the new slide seems to be about 0.0085" narrower than the original and the gib from the old slide won't go in far enough to use the gib screw. I'm basing the 0.0085" on the fact that the gib tapers 0.230" in thickness from the wide end to the narrow end, it's 15.75" in length and it sticks out 0.583" farther than it should when snug. I'd like to verify the dovetail width difference with a measuring tool, but the inner and outer edges of the dovetail are not good reference surfaces making it hard to measure. What's the best way to measure and compare the two tapered dovetails? I have a surface plate and some ground drill rod slightly smaller in diameter than the height of the dovetail, maybe I can lay the slide carrige face down on the surface plate and measure between two drill rods at two fixed locations? I have a HSS dovetail cutter the correct size to widen the dovetail, but I need to see if the dovetail is flame hardened. I could send the gib out to have it ground thinner, perhaps on a magnetic sine plate. Ideas? Hate to mess up a perfectly good cross slide made of unobtanium.